A more specific abstract decorator

[David Lucas]

I just noticed that @abstract_method decorator can be suffixed with (optional=True). Might be interesting for some methods in Encoder/Decoder (like generator matrix).

[Daniel Augot]

Not being a designer the whole system,I am not the best judge, but I think it can be useful, since there is a lot of variety in encoders and decoders, and that it can be painful and time wasting to implement things no one really care for.

Looking at this page, I see that NotImplemented is somehow returned. Would it be possible to change this string at the highest and lower levels, with something like Hey, Junior, you should really read about Sudan's agorithm before asking for a parity check matrix here ?

[David Lucas]

Resolved issue #91

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